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我正在为Android制作应用程序，并且我制作了三个按钮来播放，暂停和停止。如何在Android中播放，暂停和停止歌曲？
我的播放和暂停按钮已设置，所以当我单击播放按钮时，它将变为不可见，暂停按钮将显示，反之亦然。
当我点击播放按钮时它工作得很好，但是当我点击暂停按钮后，它给了我一个错误。
代码如下。
package com.mpIlango;
import java.io.IOException;
import java.util.ArrayList;
import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class MpIlangoActivity extends Activity implements OnCheckedChangeListener {
/** Called when the activity is first created. */
MediaPlayer song1,song2,song3;
int whatsong = 0;
private ArrayList<Integer> songIds;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
RadioGroup rgMusic = (RadioGroup) findViewById(R.id.rgMusic);
songIds = new ArrayList<Integer>();
songIds.add(R.raw.fluet);
songIds.add(R.raw.airtel);
songIds.add(R.raw.titanic);
final Button bPlay = (Button) findViewById(R.id.bPlay);
final Button bStop = (Button) findViewById(R.id.bStop);
final Button bPause = (Button) findViewById(R.id.bPause);
bPause.setVisibility(View.GONE);
rgMusic.setOnCheckedChangeListener(this);
bPlay.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(song1!=null) {
song1.release();
}
if(song2!=null) {
song2.release();
}
if(song3!=null) {
song3.release();
}
switch (whatsong) {
case 1:
try {
song1 = MediaPlayer.create(MpIlangoActivity.this, songIds.get(0));
song1.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
song1.start();
bPlay.setVisibility(View.GONE);
bPause.setVisibility(View.VISIBLE);
break;
case 2:
try {
song2 = MediaPlayer.create(MpIlangoActivity.this, songIds.get(1));
song2.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
song2.start();
bPlay.setVisibility(View.GONE);
bPause.setVisibility(View.VISIBLE);
break;
case 3:
try {
song3 = MediaPlayer.create(MpIlangoActivity.this, songIds.get(2));
song3.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
song3.start();
bPlay.setVisibility(View.GONE);
bPause.setVisibility(View.VISIBLE);
break;
}
}
});
bPause.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
bPlay.setVisibility(View.VISIBLE);
bPause.setVisibility(View.GONE);
if(song1.isPlaying()){
song1.pause();
}
if(song2.isPlaying()){
song2.pause();
}
if(song3.isPlaying()){
song3.pause();
}
}
});
bStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(song1!=null){
song1.release();
}
if(song2!=null){
song2.release();
}
if(song3!=null){
song3.release();
}
}
});;
}
@Override
public void onCheckedChanged(RadioGroup group, int rbId) {
switch (rbId) {
case R.id.rbMusic1:
whatsong = 1;
break;
case R.id.rbMusic2:
whatsong = 2;
break;
case R.id.rbMusic3:
whatsong = 3;
break;
}
}
}
请问您可以从logcat中添加错误详细信息以及... 另外，请始终尝试在您认为可能出错的部分代码中添加Log.D。 – Urban
没有错误信息，我们无法做任何事 – DallaRosa